T3B AM(EBA AND OTHER BOOT-ANIMALCULES. 13 



Besides the nucleus, a clear, round, pinkish space which 

 enlarges and contracts is usually present. This is called 

 the " contractile vesicle." 



Fig. 7. — Amoeba protetis. a, inner granular portion; c, outer clear portion of 

 the body; d, a simple pseudopod; /, a branched pseudopod; g, food-vacuole; 

 d^ a pseudopod beginning to grow out; e, one a little more developed; A, 

 food-ball; i, nucleus; k, contractile vesicle. (Magnified 200 diameters.) 



The food of the Amoeba consists of minute plants, or of 

 animalcules. After selecting its food, as for example a 

 minute plant, it engulfs or swallows it by moving toward 

 the object and gradually closing around it, until the object 



